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Singleplayer games can have replayability. Play something like dishonored and you will understand

play deez nuts bitch

but in all seriousness something like Garry's mod or Minecraft have much more replayability because you can play it with your friends and Dishonored might have multiple ways to play and complete but the multiplayer game will always be the most replayable and least predictable.

You don't seem to play a lot of fun singleplayer games. But honestly this arguing is stupid. Let's just agree that both singleplayer games and multiplayer games are equally replayable. Also I just want to say that I think one of the major reasons minecraft and Gmod are still popular it's because of modding. Not necessarily the multiplayer.